Load switch structure integrated with cable test function

Abstract

The utility model provides a load switch structure integrated with a cable test function, and aims to solve the problems that a conventional load switch cannot effectively integrate a cable withstand voltage test function and is insufficient in insulation distance. The load switch structure comprises an insulation support, an operation mechanism, a transmission assembly and a contact assembly, and a test mechanism integrated with a cable test function is specially designed. The testing mechanism is composed of three sets of insulation umbrella skirts, a connecting plate, a three-phase copper rod and a testing sleeve, the insulation distance in the cable withstand voltage testing process can be effectively increased, and the safety of equipment in the high-voltage environment is ensured. The load switch structure provided by the utility model has a high-efficiency cable test function and excellent electrical safety performance, is suitable for electrical equipment needing cable test, and has relatively high practical value and innovativeness.

Description

TECHNICAL FIELD

[0001] The utility model relates to electrical field especially relates to a load switch structure of integrated cable test function. BACKGROUND

[0002] With the continuous expansion of the power system scale and the increasing requirement of equipment intelligentization and reliability, as a crucial component in the power equipment, load switch plays a key role in current control and protection. Especially in high-voltage and super-high-voltage power grid, the performance of load switch is directly related to the safe and stable operation of the power system. The traditional load switch is mainly used for on-off control of the circuit, but with the increasing demand of power equipment operation state monitoring and fault prevention, the design of load switch has gradually developed towards integration and intelligence.

[0003] In this development process, cable state test function as an effective equipment monitoring means, gradually becomes a new additional function of load switch. Especially in high-voltage environment, cable withstand voltage test is crucial to ensure the stable operation of the power system. However, the traditional load switch design does not consider the function of cable test, which separates the cable test from the basic function of load switch, often needs additional equipment and operation steps, which brings inconvenience to the use and maintenance of the equipment. And there are the following problems: 1. The space and structure design is not optimized: the traditional ring network cabinet structure, when doing cable withstand voltage test, often needs to pull out the cable plug, connect the test device to test the cable withstand voltage, the operation is more complex; for load switch unit, due to the small size of sulfur hexafluoride load switch, and the general gas tank is larger, the internal space of load switch is not fully utilized. Especially in high-voltage environment, the connection of test equipment needs to consider the insulation distance and electrical safety of the equipment, which makes it difficult for the traditional design to effectively integrate the cable test function. 2. Insulation distance is insufficient, affecting safety: in order to ensure the safety of load switch, especially when doing cable withstand voltage test, it must meet the strict insulation distance requirement. In the existing load switch structure, the insulation distance between the grounding contact and other components often cannot meet the safety standard in high-voltage environment, which leads to the problem of electrical breakdown or local electric field concentration in the test process, affecting the safety and stability of the test. SUMMARY

[0004] (I) Technical problems solved

[0005] In view of the deficiencies of the prior art, the utility model aims at providing a load switch structure integrated with cable test function, aiming at solving the problems of insufficient space utilization and insufficient insulation distance when integrating cable withstand voltage test port of traditional load switch structure. First, the structure of load switch is integrated with test mechanism at the lower end of insulating support, which optimizes the space layout and avoids the space waste and complexity of connection with test equipment caused by independent installation of switch in traditional design. The test mechanism includes three groups of insulating umbrella skirts and three-phase copper rods, the umbrella skirts effectively improve the insulation performance of the equipment by increasing the insulation distance, and prevent electrical breakdown phenomenon. Secondly, in order to meet the safety requirements in high voltage environment, the grounding contact adopts inverted T-shaped design, which optimizes the electric field distribution, reduces the electric field strength and reduces the risk of corona discharge and insulation breakdown. The design of test bushing enables efficient connection of cable withstand voltage test equipment and load switch, and improves the convenience and safety of the test process. The application effectively integrates the cable test function, improves the space utilization of the load switch, meets the high requirements of safety and stability in cable withstand voltage test, and ensures the normal operation and reliability of the equipment in the high voltage test environment.

[0006] (II) Technical scheme

[0007] In order to achieve the above-mentioned purpose, the utility model provides the following technical scheme: a load switch structure integrated with cable test function, including insulating support, operating mechanism, transmission assembly and contact assembly, characterized in that, the lower end of the insulating support is fixed with test mechanism;

[0008] Preferably, the insulating support includes upper cross beam and lower cross beam.

[0009] Preferably, the test mechanism includes three groups of insulating umbrella skirts fixed in the insulating support, the end of the insulating umbrella skirt is fixed with connecting plate, the lower end of the connecting plate is connected with three-phase copper rod, and the end of the three-phase copper rod is fixed with test bushing.

[0010] Preferably, the transmission assembly includes transmission main shaft, the transmission main shaft is fixed with a plurality of transmission connecting pieces in the axial direction, the end of the transmission connecting piece is hinged with arc-shaped pull plate, and the arc-shaped pull plate is hinged with movable contact pull plate.

[0011] Preferably, the contact assembly includes movable contact, upper static contact and grounding contact, the upper end of the lower cross beam is fixed with three groups of movable contact seats, the upper static contact is fixed at the bottom of the upper cross beam, the contact part of the upper static contact corresponds to the middle part of the movable contact, and the two sides of the upper static contact are fixed with arc extinguishing grid.

[0012] Preferably, the left side of the grounding contact is connected with the connecting plate, and the right part is designed as inverted T shape, and the bottom of the inverted T shape is arc-shaped.

[0013] Preferably, the upper end of the movable contact seat is fixed with a connecting copper bar, and the end of the connecting copper bar is fixed with an incoming and outgoing line terminal.

[0014] Preferably, the bottom of the movable contact is hinged with the movable contact seat, and the middle part is hinged with the movable contact pull plate.

[0015] Preferably, the transmission main shaft passes through the insulating support and is rotationally connected with the operating mechanism.

[0016] Preferably, a program lock is arranged on the operating mechanism.

[0017] (Three) beneficial effects

[0018] The load switch structure with integrated cable test function provided by the utility model has remarkable beneficial effects. Firstly, through reasonable space and structure design, the problem of insufficient space utilization of the traditional load switch in the integrated cable withstand voltage test function is solved. The test mechanism and other components of the load switch are ingeniously integrated, which not only optimizes the space layout inside the load switch, but also makes the connection between the test equipment and the switch more convenient and efficient. The traditional load switch design usually has the disadvantage that the test equipment installation is complex and inconvenient due to space limitations, and the utility model greatly improves the utilization efficiency of the internal space by improving the structure, and simplifies the installation and maintenance process.

[0019] Secondly, in terms of safety, the utility model improves the insulation performance of the load switch by adding an insulating umbrella skirt and using high-standard insulating materials. Especially in the cable withstand voltage test mode, the increased insulation distance effectively prevents electrical breakdown and local electric field concentration problems, ensuring the stability and safety of the equipment during the test process. At the same time, the inverted T-shaped design of the grounding contact optimizes the electric field distribution, reduces the risk of corona discharge, and further improves the working safety of the equipment in a high-voltage environment. In summary, the utility model not only improves the functional integration of the load switch and optimizes the space layout, but also effectively improves the electrical safety performance, ensures the stability and reliability of the equipment in the high-voltage cable test environment, has strong market competitiveness and broad application prospect. DRAWINGS

[0020] Figure 1 It is a whole schematic view of the utility model.

[0021] Figure 2 It is a schematic view of the transmission assembly of the utility model.

[0022] Figure 3 It is Figure 2 It is a whole sectional view of the utility model.

[0023] Figure 4 It is a schematic view of the grounding contact in the utility model.

[0024] In the figure: 1-insulating support, 2-operating mechanism, 3-transmission assembly, 4-contact assembly, 5-testing mechanism, 6-connection copper bar, 7-in and out line terminal, 11-upper cross beam, 12-lower cross beam, 21-program lock, 31-transmission main shaft, 32-transmission connecting piece, 33-arc-shaped pull plate, 34-moving contact pull plate, 41-moving contact, 42-upper static contact, 43-ground contact, 44-moving contact seat, 45-arc extinguishing grid piece, 431-connection part, 51-insulating umbrella skirt, 52-connection plate, 53-three-phase copper bar, 54-testing sleeve. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the utility model will be described below with reference to the drawings in the embodiments of the utility model. Figures 1-4 The technical solutions in the embodiments of the utility model will be described below with reference to the drawings in the embodiments of the utility model.

[0026] A load switch structure integrated with cable testing function, comprising an insulating support 1, an operating mechanism 2, a transmission assembly 3 and a contact assembly 4, wherein the lower end of the insulating support 1 is fixed with a testing mechanism 5; the insulating support 1 serves as the basic support of the whole load switch structure, provides installation positions for other components, ensures the relative position accuracy between components, and at the same time, plays a good insulation role, prevents current leakage and ensures the safe operation of the equipment. The operating mechanism 2 is used for controlling the opening and closing operations of the load switch, providing necessary operating force and operating speed, so that the load switch can quickly and accurately perform the on-off task. The transmission assembly 3 transmits the power of the operating mechanism to the contact assembly, realizing the opening and closing actions of the contact. The contact assembly 4 directly performs the on-off task of the circuit. The testing mechanism 5 is specially used for the cable testing function. In the cable pressure test, the testing mechanism is connected with the cable and the testing equipment through a specific connection mode. The insulating support 1 comprises an upper cross beam 11 and a lower cross beam 12, which are the components of the insulating support and enhance the structural strength of the insulating support, and at the same time, provide installation support for other components. The operating mechanism 2 is provided with a program lock 21, which has an important safety protection function. When the cable test is needed, the program lock 21 is turned to the corresponding position, so that the load switch can be kept in the closed state, and at the same time, the operating mechanism 2 enters the locked state. This design effectively prevents dangerous situations such as opening of the load switch caused by misoperation during the test process, and ensures the safety and stability of the test process.

[0027] The test mechanism 5 includes three groups of insulating umbrella skirts 51 fixed inside the insulating support 1, the end of the insulating umbrella skirts 51 is fixed with a connecting plate 52, the lower end of the connecting plate 52 is connected with a three-phase copper rod 53, the end of the three-phase copper rod is fixed with a test bushing 54.

[0028] The three groups of insulating umbrella skirts 51 are fixed inside the insulating support 1, which can significantly increase the insulation distance during the cable test, especially in a high-voltage test environment. It effectively prevents the insulation breakdown between the internal components of the test mechanism and the components and the external environment, ensuring the safety of the test process; its structural design can guide the electric field distribution and reduce the electric field concentration, further improving the insulation performance and ensuring that the test work can be carried out in a stable electrical environment. The connecting plate 52 ensures good electrical conductivity between components, allowing test signals to be transmitted smoothly from the three-phase copper rod to other components, while also transmitting signals fed back by the cable to the test equipment. The three-phase copper rod 53 is used to connect the circuit and the test terminal. The test bushing 54 is fixed at the end of the three-phase copper rod and has multiple functions. First, it protects the end of the three-phase copper rod from external environmental factors such as dust and moisture, preventing electrical performance degradation or short circuits caused by environmental factors. Second, the test bushing facilitates the connection of the test mechanism with external test equipment, providing a standardized connection interface that allows the test equipment to quickly and accurately connect with the three-phase copper rod, improving the efficiency and convenience of the test work.

[0029] The transmission assembly 3 includes a transmission main shaft 31, a plurality of transmission connecting pieces 32 are fixed axially on the transmission main shaft 31, arc-shaped pull plates 33 are hinged at the ends of the transmission connecting pieces 32, and moving contact pull plates 34 are hinged between the arc-shaped pull plates 33. The transmission main shaft 31 is responsible for transmitting the power of the operating mechanism 2 in the transmission assembly 3, driving other transmission components to move, thereby realizing the action of the contact assembly 4, and is a key component for transmitting the power of the load switch. The transmission connecting pieces 32 convert the rotation of the transmission main shaft 31 into movement in a specific direction and transmit it to the arc-shaped pull plates 33, which play a role in conversion and transmission during power transmission. The arc-shaped pull plates 33 cooperate with the transmission connecting pieces 32 and the moving contact pull plates 34 to change the direction of force transmission, accurately control the movement of the moving contact 41, and ensure the opening and closing action of the contact to be accurate. The moving contact pull plates 34 directly pull the moving contact 41 to realize the opening and closing action of the moving contact and the upper static contact 42, thereby controlling the on-off of the circuit. During normal operation and testing of the load switch, the accuracy of the action of the moving contact pull plate is crucial to the performance of the load switch.

[0030] The contact assembly 4 includes a movable contact 41, an upper stationary contact 42, and a ground contact 43. Three groups of movable contact seats 44 are fixed to the upper end of the lower cross beam 12. The upper stationary contact 42 is fixed to the bottom of the upper cross beam 11. The contact portion of the upper stationary contact 42 corresponds to the middle portion of the movable contact 42. Arc extinguishing grid fins 45 are fixed to the two sides of the upper stationary contact 42. The bottom of the movable contact 41 is hinged to the movable contact seat 44, and the middle portion is hinged to the movable contact pull plate 34.

[0031] The movable contact 41 is the key movable component in the contact assembly 4 that realizes the on-off of the circuit. The bottom is hinged to the movable contact seat 44, allowing the movable contact to rotate flexibly. The middle portion is hinged to the movable contact pull plate 34, which, under the pull of the movable contact pull plate, realizes the contact or separation of the movable contact 41 and the upper stationary contact 42, thereby controlling the conduction and cut-off of the circuit. The upper stationary contact 42 is fixed to the bottom of the upper cross beam 11, and its contact portion corresponds to the middle portion of the movable contact 41. When the movable contact 41 moves to contact the upper stationary contact 42, the circuit forms a path, and the current can pass smoothly. The arc extinguishing grid fins 45 are fixed to the two sides of the upper stationary contact 42. When the movable contact 41 and the upper stationary contact 42 break the circuit, an arc is generated. The arc extinguishing grid fins 45 can quickly divide and cool the arc, thereby quickly extinguishing the arc, reducing the burning of the contact by the arc, and improving the breaking capacity and working reliability of the load switch.

[0032] The movable contact seat 44 is fixed to the upper end of the lower cross beam 12 and is used to stably support and fix the movable contact 41. It provides a reliable mounting base for the movable contact 41, ensuring the stability and accuracy of the movable contact during movement. At the same time, the upper end of the movable contact seat 44 is fixed with a connecting copper bar 6, realizing electrical connection with other electrical components. The arc extinguishing grid fins 45 are installed on the two sides of the upper stationary contact 42. Their main function is to divide the arc into multiple small sections when the movable contact 41 and the upper stationary contact 42 break the circuit, increasing the length and surface area of the arc, and rapidly cooling the arc to quickly extinguish it. The presence of the arc extinguishing grid fins 45 effectively protects the contact, prolongs the service life of the contact, and improves the breaking performance and operational safety of the load switch.

[0033] The left side of the grounding contact 43 is a connecting part 431, which is fixedly connected with the connecting plate 52, and the right part is designed in an inverted T shape, and the bottom of the inverted T shape is in an arc shape. On the one hand, the grounding contact 43 is fixed with the connecting plate 52, and plays a certain fixing and supporting role; on the other hand, the grounding contact 43 can safely introduce current into the ground under normal operation or fault conditions of the equipment, ensuring the safety of the equipment and personnel. The special shape of the grounding contact 43 can optimize the electric field distribution and improve the grounding effect. The left side of the grounding contact 43 is a connecting part 431, which is fixedly connected with the connecting plate 52, and the right part is designed in an inverted T shape, and the bottom of the inverted T shape is in an arc shape. The connecting part 2191 firmly fixes the grounding contact 43 on the insulating umbrella skirt, providing stable mechanical support for the grounding contact. The inverted T structure provides better mechanical adaptability for connection with other components. Secondly, in a high-voltage environment, sharp corners are prone to cause electric field concentration, while the arc-shaped design can make the electric field lines more evenly distributed around the grounding contact. This can reduce the local electric field strength and reduce the risk of corona discharge and insulation breakdown.

[0034] The upper end of the movable contact seat 44 is fixed with a connecting copper bar 6, and the end of the connecting copper bar 6 is fixed with an incoming and outgoing line terminal 7. The connecting copper bar 6 is used to connect the movable contact seat 44 with the incoming and outgoing line terminal 7, forming a channel for current transmission. When the load switch is working, the current is transmitted from the incoming and outgoing line terminal 7 to the movable contact seat 44 through the connecting copper bar 6, and then passes through the contact between the movable contact 41 and the upper static contact 42 to realize the conduction of the circuit. The incoming and outgoing line terminal 7 is the interface component of the load switch and the external circuit. It realizes the electrical connection between the load switch and the power system, so that the current can smoothly enter and exit the load switch, ensuring the normal operation of the power system.

[0035] Working principle: The load switch with integrated cable test function described in the patent has two main modes of normal operation and cable test when working.

[0036] In the normal operation mode, the operating mechanism 2 receives an external control signal and generates an operating force. The force is transmitted through the transmission assembly 3, the transmission main shaft 31 rotates, drives the transmission connecting piece 32 to move, and then drives the arc-shaped pull plate 33 and the movable contact pull plate 34 to act. The movable contact pull plate 34 pulls the movable contact 41, which rotates around the movable contact seat 44, and contacts the upper static contact 42, the circuit is conducted, and the current is transmitted from the incoming and outgoing line terminal 7 to the other side circuit through the connecting copper bar 6, the movable contact seat 44, the movable contact 41, and the upper static contact 42. When it is necessary to cut off the circuit, the operating mechanism 2 acts in reverse, the movable contact 41 is separated from the upper static contact 42, and the current path is cut off. During the breaking process, the arc extinguishing grid pieces 45 on both sides of the upper static contact 42 rapidly divide and cool the arc, ensuring safe and reliable breaking.

[0037] When entering the cable test mode, first turn the program lock 21 on the operating mechanism 2 to the corresponding position, at this time the load switch remains closed, the operating mechanism 2 enters the locked state to prevent misoperation. The test mechanism 5 starts to work, the insulating umbrella skirt 51 in the test mechanism increases the insulation distance to ensure the test safety. The three-phase copper rod 53 and the test bushing 54 are connected with the high-voltage test equipment to test the withstand voltage of the cable. The grounding contact 43 is connected with the connecting plate 52 through the left connecting part 431, which plays a grounding role in the test to ensure that the electric charge is safely introduced into the ground during the test. After the test is completed, remove the test equipment, connect the grounding short-circuiting row, make the grounding switch return to the grounding state, close the compartment door, then operate the switch to open, and restore the normal three-position function of the load switch.

[0038] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A load switch structure integrated with a cable testing function, comprising an insulating support (1), an operating mechanism (2), a transmission assembly (3) and a contact assembly (4), characterized in that, The lower end of the insulating support (1) is fixed with a test mechanism (5); The insulating support (1) comprises an upper cross beam (11) and a lower cross beam (12); The test mechanism (5) comprises three groups of insulating umbrella skirts (51) fixed in the insulating support (1), the end of the insulating umbrella skirt (51) is fixed with a connecting plate (52), the lower end of the connecting plate (52) is connected with a three-phase copper bar (53), the end of the three-phase copper bar is fixed with a test sleeve (54).

2. The load switch structure integrated with a cable test function according to claim 1, characterized in that, The transmission assembly (3) comprises a transmission main shaft (31), the transmission main shaft (31) is axially fixed with a plurality of groups of transmission connecting pieces (32), the end of the transmission connecting piece (32) is hingedly connected with an arc-shaped pull plate (33), the arc-shaped pull plates (33) are hingedly connected with a moving contact pull plate (34).

3. The load switch structure integrated with a cable testing function according to claim 1, wherein The contact assembly (4) comprises a moving contact (41), an upper static contact (42) and a grounding contact (43), the upper end of the lower cross beam (12) is fixed with three groups of moving contact seats (44), the upper static contact (42) is fixed at the bottom of the upper cross beam (11), the contact part of the upper static contact (42) corresponds to the middle part of the moving contact (41), and the two sides of the upper static contact (42) are fixed with arc extinguishing grid fins (45).

4. A load switch structure integrated with a cable testing function according to claim 3, characterized in that, The left side of the grounding contact (43) is a connecting part (431) fixedly connected with the connecting plate (52), and the right part is designed in an inverted T shape, and the bottom of the inverted T shape is in an arc shape.

5. The load switch structure integrated with a cable test function according to claim 3, wherein The upper end of the moving contact seat (44) is fixed with a connecting copper bar (6), and the end of the connecting copper bar (6) is fixed with an incoming and outgoing line terminal (7).

6. The load switch structure integrated with a cable test function according to claim 3, wherein The bottom of the moving contact (41) is hingedly connected with the moving contact seat (44), and the middle part is hingedly connected with the moving contact pull plate (34).

7. The load switch structure integrated with a cable testing function according to claim 2, wherein The transmission main shaft (31) penetrates through the insulating support (1) and is rotationally connected with the operating mechanism (2).

8. The load switch structure integrated with a cable testing function according to claim 1, wherein The operating mechanism (2) is provided with a program lock (21).

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